Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 2039

August 5, 20085 counties in Montana; 11 counties in South Dakota; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2008, 8:40 PM MDT for 5 counties in Montana; 11 counties in South Dakota; 4 counties in Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 5, 2008, 8:40 PM MDT (02:40 UTC)
Expired
Aug 5, 2008, 10:45 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.7 hours before the alert went out and 112 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Rapid City, SD at 00:00Z on 2008-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 161 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2008-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
161 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
2178 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in South Dakota, 2008Mesoscale Discussions in Montana, 2008Mesoscale Discussions in Wyoming, 2008Every mesoscale discussion in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.